DE1451451C - Oil or gas burner with a cross flow blower - Google Patents

Description

adjustable cover plate 11 is arranged with an annular groove 12 into which the blade ring 13 of the fan rotor 6 protrudes depending on its adjustment position. The cover plate 11 and the housing part 4 have inlet bends 14 and 15 at the air inlet point of the fan housing, which form the inlet funnel 14, 15. The blade ring 13 of the fan rotor 6 can also be subdivided by intermediate disks 21, which prevent a backflow when the cover disk 11 is pushed over. Depending on the air throughput with which the fan arrangement is to work, the cover plate 11 is displaced more or less axially. The blade ring 13 of the fan rotor 6 is then covered to a greater or lesser extent by the cover disk 11 as a result of the annular groove 12. If, for example, the fan arrangement is to work with a small air throughput, the cover plate 11 is shifted to the left and locked in the set position. If the air throughput is smaller than before, the characteristic curve then shifts to the left, but its steep character is retained. In Fig. 2, this shifted steep characteristic is shown in dashed lines at Kgz . Corresponding characteristic curves are thus created during the axial adjustment of the cover disk 11, with the entire pressure range of the blower _{being available, for example, to a new design point i 2} with the volume F _2.

ίο With the new air blower, this can now The exact oil-air mixture can already be set by a specialist during the manufacture of the burner and installed by each assistant in the most varied of combustion chambers with different pressure losses will. This cross-flow fan control can be used for a variety of problems come, all of which are characterized by the fact that an increase in pressure in the system does not result in a decrease in throughput may be connected.

1 sheet of drawings

Claims (3)

1 2 position quite different, quite apart from the fact that patent claims: the use of an installation manifold has not been proposed here either. 1. Oil or gas burner with a through a The arrangement can, for. B. be made so that electric motor-driven cross-flow fan with 5, the air volume control device is formed as part of the fan, a curved inlet funnel and an air housing. This arrangement is characterized by a flow control device, which is characterized by a simple, practical structure. draws that the air quantity regulating device In the drawing, an embodiment of the device from an axially adjustable cover object of the invention is shown. It shows
(11) consists of one of the blade ring (13) of the io F i g. 1 the characteristic curve of a conventional Ge impeller (6) opposite ring groove (12) biases for oil burners, with one of the width of the blade ring ent- Fig. 2 the characteristic curve of a fan in connection Has speaking depth into which the blade ring with a burner arrangement according to the invention and of the impeller of the adjustment position of the control input F i g. 3 shows an arrangement according to the invention in FIG direction corresponding more or less 15 a front view, partially cut, protrudes and the with the opposite In F i g. 1 is the blower characteristic Kg _{1 of} a con- The curved inlet funnel (14, conventional air blower for an oil burner. 15) forms. represents. The point of intersection J ₁ between the fan characteristics 2. Oil or gas burner with cross-flow fan line Kg ₁ and the operating characteristic Kb ₁ gives the according to claim 1, characterized in that 20 operating or design point. In order to achieve a large air throughput in such known air blowers, the air volume regulating device is designed as part of the air blower housing (4, 8). the blower used for the setting must 3. The oil or gas burner with the cross-flow fan must be opened strongly. At the disengagement point J ₁ according to claim 1 or 2, characterized in that a certain oil throughput _{belongs to the air volume F 1} and to the counter seat of the blade ring (13) of the fan rotor (6) 25 pressure Ap _1. If it is divided by washers. Back pressure in the combustion chamber, for example Ap ₂ increases, the volume decreases by AV ₁ , with the dashed line L ₁ the maximum fluctuation of the Operating characteristic Kb _{1 should} display. The consequence of this is that there is no air for stoichiometric combustion, The invention relates to an oil or gas burner so that the burner gives off soot. To achieve a smaller one with an air throughput driven by an electric motor with the same burner fan Cross-flow fan with a curved inlet, on the other hand, the throttle can be closed more tightly. Man funnel and an air volume control device. then receives the design point S ₂ , to which the air It has already been proposed (French 35 volume F ₂ heard. With fluctuations in pressure, this decreases Patent specification 1 263 871), burner the volume in question here by A F ₂ . With the dashed line L ₂ to operate standing type with cross-flow fans. is again the maximum fluctuation in the operating A control of the burner without flow separation characteristic curve Kb ₂ marked. With the known However, in these known arrangements, air blowers are not, therefore, each volume flow possible, so that associated with pulsation phenomena at 40 quite specific combustion chamber pressure. Brenner must be expected. In contrast, In Fig. 2 is the characteristic of the invention The present invention set itself the task of air blower assembly shown, which runs steeply, as to prevent a separation of the flow and that this with the so-called highly stable cross-flow is the case with an even flow of air at the burner to blower. This characteristic is so steep achieve. 45 that with an increase in back pressure up to a For the above-mentioned purpose, according to the invented maximum size, no or only one provision is provided in the new arrangement so that the extremely small decrease in volume takes place. This steep air volume control device from an axially adjustable characteristic curve is denoted by Kg. Your cash cover plate is that the shovel a point of intersection f _x with the operating characteristic gives coronary Kb of the impeller opposite annular groove 50 back to disengagement with the air volume _f1. one corresponding to the width of the blade ring. The dashed line L ₃ in turn represents the maximum depth to which the blade ring of the impeller shows fluctuations in the operating characteristic curve Kb . As the adjustment position dec. Control device according to this diagram can be seen, affect more or less far into it, and with the pressure increases in the furnace no longer disadvantageously opposite housing side the curved 55 on the air throughput of the fan. The fire inlet funnel forms. room pressure can easily be of different sizes. The invention has the advantage that the throughput is always largely the same, which is undesirable in the air. It therefore remains that which has been set once avoided, which on the one hand to the invention oil-air mixture constant. appropriate design of the regulating member and, on the other hand, 60. In the case of the air blower arrangement according to FIG. 3 is is due to the formation of the enema. the drive motor 1 at points 2, 3 of the fan Housing part 4 is already attached in German patent specification 364 732. With the motor shaft 5 is a the air volume control for radial fans is connected with the aid of fan blades 6 which are open on one side. Also the an axially adjustable and when it is adjusted in oil pump 7 is on the fan housing, namely on the 65 Part 8 of the fan housing is attached. Your through that The shaft 9 protruding in its various adjustable fan interior is via an elastic Lay the blade ring of the impeller or the coupling 10 connected to the motor shaft 5. On covers less, but the task is there- the fan housing 4, 8 is one according to the invention